CARABID.E 3 1 



Maronetus tenuis n. sp. Form slender, very convex and shining, 

 somewhat piceous-black, the legs piceous; head scarcely two-thirds as 

 wide as the prothorax, the eyes moderate; labral lobes very slender, the 

 notch almost attaining the base; front smooth; supra-antennal edge 

 strongly elevated; antennae slender, testaceous, not quite two-thirds as 

 long as the body, the basal joint not quite as long as the next three com- 

 bined; prothorax narrow, longer than wide, the sides inflated and evenly 

 rounded anteriorly, oblique and straight thence to the base, which is 

 feebly sinuate medially, two-thirds the maximum width and slightly 

 wider than the apex, the latter truncate, with obtuse and broadly rounded 

 angles; surface smooth, the transverse impressions rather sharply marked, 

 the stria connecting them along the middle distinct, the basal foveae 

 deep, short, impunctate, separated from the margin by a thin cariniform 

 wall; lateral edges without trace of reflexed margin; elytra elongate-oval, 

 three-fourths longer than wide, less than twice as wide as the prothorax, 

 the sutural stria coarse, deep, coarsely punctate, extending from near 

 the base to apical third, the second stria much less coarse and more 

 finely punctate, extending less closely to the base and obsolete behind 

 the middle, the third stria represented only by a very fine feeble im- 

 punctate impressed line, very short and only visible by very oblique 

 illumination; all the other striae completely obsolete, the surface very 

 smooth and polished; the fine marginal stria is visible feebly near the 

 apex; reflexed margin extremely fine; legs slender, the hind tarsi rather 

 short, slender. Length (9) 6.8 mm.; width 2.1 mm. North Carolina 

 (Black Mts.), Beutenmuller. 



This remarkable species, the smallest of our Cychrini, may be 

 distinguished at once from imperfectus Horn, with which it has been 

 confounded, by the complete absence of any trace of a reflexed 

 lateral thoracic margin, by having only two elytral striae and by 

 its smaller size and more slender form. In imperfectus the pro- 

 thorax is much less narrow than in tenuis and there is a distinct and 

 entire though rather feebly developed reflexed thoracic margin. 

 The setigerous puncture at two-fifths from the apex the point of 

 maximum width is as well developed as usual; the subbasal punc- 

 ture and seta are rather small but distinct. This genus, besides 

 tenuis and imperfectus, will comprise a number of other species 

 such as hubbardi and incompletus Schwarz and schwarzi Beuten- 

 muller. 



Tribe CARABINI. 

 Calosoma Weber. 



I have recently received from Mr. Knaus three specimens in 

 this genus that are of peculiar interest. One of them is the true 

 prominens, of LeConte, taken at Phoenix, Ariz., and hitherto not 



